2.1.4. Lignans

Three lignans compounds could be identified in the different olive leaf extracts under study. Peaks 12, 15, and 16 showed ions at *m/z* 417.1555, 357.1344, and 415.1398, respectively, that were determined as syringaresinol, pinoresinol, and acetoxypinoresinol, respectively. These lignans were also reported in our previous work on fresh leaves [13].

### 2.1.5. Other Polar Compounds

Peak 4 with an ion at *m/z* 401.1453 eluted at 11.10 min and was identified as benzyl alcohol pentose. This polar compound was reported in olive leaves in previous literature [17] as well as in other plant extracts [18,19].
